configs/topologies/Crossbar.py

   1 # Copyright (c) 2010 Advanced Micro Devices, Inc.
   2 # All rights reserved.
   3 #
   4 # Redistribution and use in source and binary forms, with or without
   5 # modification, are permitted provided that the following conditions are
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   7 # notice, this list of conditions and the following disclaimer;
   8 # redistributions in binary form must reproduce the above copyright
   9 # notice, this list of conditions and the following disclaimer in the
  10 # documentation and/or other materials provided with the distribution;
  11 # neither the name of the copyright holders nor the names of its
  12 # contributors may be used to endorse or promote products derived from
  13 # this software without specific prior written permission.
  14 #
  15 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  19 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  25 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26
  27 from __future__ import print_function
  28 from __future__ import absolute_import
  29
  30 from m5.params import *
  31 from m5.objects import *
  32
  33 from .BaseTopology import SimpleTopology
  34
  35 class Crossbar(SimpleTopology):
  36     description='Crossbar'
  37
  38     def makeTopology(self, options, network, IntLink, ExtLink, Router):
  39
  40         # default values for link latency and router latency.
  41         # Can be over-ridden on a per link/router basis
  42         link_latency = options.link_latency # used by simple and garnet
  43         router_latency = options.router_latency # only used by garnet
  44
  45         # Create an individual router for each controller plus one more for
  46         # the centralized crossbar.  The large numbers of routers are needed
  47         # because external links do not model outgoing bandwidth in the
  48         # simple network, but internal links do.
  49         # For garnet, one router suffices, use CrossbarGarnet.py
  50
  51         routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
  52         xbar = routers[len(self.nodes)] # the crossbar router is the last router created
  53         network.routers = routers
  54
  55         ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i],
  56                              latency = link_latency)
  57                         for (i, n) in enumerate(self.nodes)]
  58         network.ext_links = ext_links
  59
  60         link_count = len(self.nodes)
  61
  62         int_links = []
  63         for i in range(len(self.nodes)):
  64             int_links.append(IntLink(link_id=(link_count+i),
  65                                      src_node=routers[i],
  66                                      dst_node=xbar,
  67                                      latency = link_latency))
  68
  69         link_count += len(self.nodes)
  70
  71         for i in range(len(self.nodes)):
  72             int_links.append(IntLink(link_id=(link_count+i),
  73                                      src_node=xbar,
  74                                      dst_node=routers[i],
  75                                      latency = link_latency))
  76
  77         network.int_links = int_links